TIDE OFFICE · WING C

harbor-master's instrument wall — three ports on the ledger

Tide clock — 12h 25m lunar cycle

HIGH WATER LOW WATER EBB FLOOD SLACK · RISING

Chart recorder — pen nº 3

paper advances with the tide · hover for a reading · M drops a mark flag

Depth gauge

4.20 m
above chart datum
+0.42 m/h
current rate of rise

Controls

Port
Chronometer speed
Scrub time ± hours (0)